I had a comment from Old Vic in my UK Truck Photos post about the unusual ERF. It looks to me like the earlier ERF cab that had an upright grille, but with the later KV grille fitted. With some further investigation I found this photo in the late Pat Kennett's World Trucks No.1 book. He describes it as a "hybrid" cab and comments that he thinks one has survived in the fleet of Beresford Transport. It's very similar to my picture, the only difference being the straight line to the bottom edge of the door, whereas my one has a curve over the wheel arch.